Immune Deficiency causes
back to top
Infection is the invasion and replication of microorganisms-viruses, bacteria, protozoa, or fungi-in body tissues.
Infectious diseases are those that are transmitted from person to person by direct or indirect contact. Viruses, bacteria, parasites, and fungi all cause infectious disease.
A nutritional deficiency occurs when the body doesn't absorb the necessary amount of a nutrient. Deficiencies can lead to a variety of health problems.